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STOCK-BASED COMPENSATION - Schedule of Significant Price Ranges of Options Outstanding, Related Weighted Average Exercise Prices and Contractual Life Information (Details)
shares in Thousands
12 Months Ended
Dec. 30, 2018
$ / shares
shares
$0.78  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, minimum (in dollars per share) $ 0.78
Options Outstanding (in shares) | shares 4
Weighted Average Remaining Contractual Life 2 months 4 days
Weighted Average Exercise Price (in dollars per share) $ 0.78
Options Vested and Exercisable (in shares) | shares 4
Weighted Average Exercise Price (in dollars per share) $ 0.78
0.86  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, minimum (in dollars per share) $ 0.86
Options Outstanding (in shares) | shares 726
Weighted Average Remaining Contractual Life 7 years 8 months 8 days
Weighted Average Exercise Price (in dollars per share) $ 0.86
Options Vested and Exercisable (in shares) | shares 408
Weighted Average Exercise Price (in dollars per share) $ 0.86
$1.32  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, minimum (in dollars per share) $ 1.32
Options Outstanding (in shares) | shares 66
Weighted Average Remaining Contractual Life 6 years 10 months 24 days
Weighted Average Exercise Price (in dollars per share) $ 1.32
Options Vested and Exercisable (in shares) | shares 51
Weighted Average Exercise Price (in dollars per share) $ 1.32
1.63  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, minimum (in dollars per share) $ 1.63
Options Outstanding (in shares) | shares 545
Weighted Average Remaining Contractual Life 3 months 7 days
Weighted Average Exercise Price (in dollars per share) $ 1.63
Options Vested and Exercisable (in shares) | shares 545
Weighted Average Exercise Price (in dollars per share) $ 1.63
$2.17 - $2.65  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 287
Weighted Average Remaining Contractual Life 3 years 7 months 28 days
Weighted Average Exercise Price (in dollars per share) $ 2.25
Options Vested and Exercisable (in shares) | shares 287
Weighted Average Exercise Price (in dollars per share) $ 2.25
$2.17 - $2.65 | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, minimum (in dollars per share) 2.17
$2.17 - $2.65 | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, maximum (in dollars per share) 2.65
2.78  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, minimum (in dollars per share) $ 2.78
Options Outstanding (in shares) | shares 944
Weighted Average Remaining Contractual Life 1 year 11 months 4 days
Weighted Average Exercise Price (in dollars per share) $ 2.78
Options Vested and Exercisable (in shares) | shares 944
Weighted Average Exercise Price (in dollars per share) $ 2.78
$2.82 - $3.36  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 222
Weighted Average Remaining Contractual Life 4 years 5 months 4 days
Weighted Average Exercise Price (in dollars per share) $ 3.16
Options Vested and Exercisable (in shares) | shares 222
Weighted Average Exercise Price (in dollars per share) $ 3.16
$2.82 - $3.36 | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, minimum (in dollars per share) 2.82
$2.82 - $3.36 | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, maximum (in dollars per share) 3.36
3.39  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, minimum (in dollars per share) $ 3.39
Options Outstanding (in shares) | shares 237
Weighted Average Remaining Contractual Life 4 years 8 months 23 days
Weighted Average Exercise Price (in dollars per share) $ 3.39
Options Vested and Exercisable (in shares) | shares 237
Weighted Average Exercise Price (in dollars per share) $ 3.39
3.48  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, minimum (in dollars per share) $ 3.48
Options Outstanding (in shares) | shares 105
Weighted Average Remaining Contractual Life 3 years 4 months 9 days
Weighted Average Exercise Price (in dollars per share) $ 3.48
Options Vested and Exercisable (in shares) | shares 105
Weighted Average Exercise Price (in dollars per share) $ 3.48
3.82  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, minimum (in dollars per share) $ 3.82
Options Outstanding (in shares) | shares 65
Weighted Average Remaining Contractual Life 5 years 29 days
Weighted Average Exercise Price (in dollars per share) $ 3.82
Options Vested and Exercisable (in shares) | shares 65
Weighted Average Exercise Price (in dollars per share) $ 3.82
$0.78 - $3.82  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 3,201
Weighted Average Remaining Contractual Life 3 years 8 months 12 days
Weighted Average Exercise Price (in dollars per share) $ 2.18
Options Vested and Exercisable (in shares) | shares 2,868
Weighted Average Exercise Price (in dollars per share) $ 2.33
$0.78 - $3.82 | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, minimum (in dollars per share) 0.78
$0.78 - $3.82 | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, maximum (in dollars per share) $ 3.82